chore: add vendor directory

1 files changed, 762 insertions, 0 deletions

diff --git a/vendor/windows-interface/src/lib.rs b/vendor/windows-interface/src/lib.rs
new file mode 100644
index 00000000..73c8f40c
--- /dev/null
+++ b/vendor/windows-interface/src/lib.rs
@@ -0,0 +1,762 @@
+//! Define COM interfaces to call or implement.
+//!
+//! Take a look at [macro@interface] for an example.
+//!
+//! Learn more about Rust for Windows here: <https://github.com/microsoft/windows-rs>
+
+use quote::quote;
+use syn::spanned::Spanned;
+
+/// Defines a COM interface to call or implement.
+///
+/// # Example
+/// ```rust,no_run
+/// use windows_core::*;
+///
+/// #[interface("094d70d6-5202-44b8-abb8-43860da5aca2")]
+/// unsafe trait IValue: IUnknown {
+///     fn GetValue(&self, value: *mut i32) -> HRESULT;
+/// }
+///
+/// #[implement(IValue)]
+/// struct Value(i32);
+///
+/// impl IValue_Impl for Value_Impl {
+///     unsafe fn GetValue(&self, value: *mut i32) -> HRESULT {
+///         *value = self.0;
+///         HRESULT(0)
+///     }
+/// }
+///
+/// let object: IValue = Value(123).into();
+/// // Call interface methods...
+/// ```
+#[proc_macro_attribute]
+pub fn interface(
+    attributes: proc_macro::TokenStream,
+    original_type: proc_macro::TokenStream,
+) -> proc_macro::TokenStream {
+    let guid = syn::parse_macro_input!(attributes as Guid);
+    let interface = syn::parse_macro_input!(original_type as Interface);
+    let tokens = match interface.gen_tokens(&guid) {
+        Ok(t) => t,
+        Err(e) => return e.to_compile_error().into(),
+    };
+    tokens.into()
+}
+
+macro_rules! bail {
+    ($item:expr, $($msg:tt),*) => {
+        return Err(syn::Error::new($item.span(), std::fmt::format(format_args!($($msg),*))));
+    };
+
+}
+
+macro_rules! unexpected_token {
+    ($item:expr, $msg:expr) => {
+        if let Some(i) = $item {
+            bail!(i, "unexpected {}", $msg);
+        }
+    };
+}
+macro_rules! expected_token {
+    ($sig:tt.$item:tt(), $msg:expr) => {
+        if let None = $sig.$item() {
+            bail!($sig, "expected {}", $msg);
+        }
+    };
+}
+
+/// Parsed interface
+///
+/// ```rust,ignore
+/// #[windows_interface::interface("8CEEB155-2849-4ce5-9448-91FF70E1E4D9")]
+/// unsafe trait IUIAnimationVariable: IUnknown {
+/// //^ parses this
+///     fn GetValue(&self, value: *mut f64) -> HRESULT;
+/// }
+/// ```
+struct Interface {
+    visibility: syn::Visibility,
+    name: syn::Ident,
+    parent: Option<syn::Path>,
+    methods: Vec<InterfaceMethod>,
+    docs: Vec<syn::Attribute>,
+}
+
+impl Interface {
+    /// Generates all the code needed for a COM interface
+    fn gen_tokens(&self, guid: &Guid) -> syn::Result<proc_macro2::TokenStream> {
+        let vis = &self.visibility;
+        let name = &self.name;
+        let docs = &self.docs;
+        let parent = self.parent_type();
+        let vtable_name = quote::format_ident!("{}_Vtbl", name);
+        let guid = guid.to_tokens()?;
+        let implementation = self.gen_implementation();
+        let com_trait = self.get_com_trait();
+        let vtable = self.gen_vtable(&vtable_name);
+        let conversions = self.gen_conversions();
+
+        Ok(quote! {
+            #[repr(transparent)]
+            #(#docs)*
+            #vis struct #name(#parent);
+            #implementation
+            unsafe impl ::windows_core::Interface for #name {
+                type Vtable = #vtable_name;
+                const IID: ::windows_core::GUID = #guid;
+            }
+            impl ::windows_core::RuntimeName for #name {}
+            impl ::core::ops::Deref for #name {
+                type Target = #parent;
+                fn deref(&self) -> &Self::Target {
+                    unsafe { ::core::mem::transmute(self) }
+                }
+            }
+            #com_trait
+            #vtable
+            #conversions
+        })
+    }
+
+    /// Generates the methods users can call on the COM interface pointer
+    fn gen_implementation(&self) -> proc_macro2::TokenStream {
+        let name = &self.name;
+        let methods = self
+            .methods
+            .iter()
+            .map(|m| {
+                let vis = &m.visibility;
+                let name = &m.name;
+
+                let generics = m.gen_consume_generics();
+                let params = m.gen_consume_params();
+                let args = m.gen_consume_args();
+                let ret = &m.ret;
+
+                if m.is_result() {
+                    quote! {
+                    #[inline(always)]
+                    #vis unsafe fn #name<#(#generics),*>(&self, #(#params),*) #ret {
+                            (::windows_core::Interface::vtable(self).#name)(::windows_core::Interface::as_raw(self), #(#args),*).ok()
+                        }
+                    }
+                } else {
+                    quote! {
+                        #[inline(always)]
+                        #vis unsafe fn #name<#(#generics),*>(&self, #(#params),*) #ret {
+                            (::windows_core::Interface::vtable(self).#name)(::windows_core::Interface::as_raw(self), #(#args),*)
+                        }
+                    }
+                }
+            })
+            .collect::<Vec<_>>();
+        quote! {
+            impl #name {
+                #(#methods)*
+            }
+        }
+    }
+
+    fn get_com_trait(&self) -> proc_macro2::TokenStream {
+        let name = quote::format_ident!("{}_Impl", self.name);
+        let vis = &self.visibility;
+        let methods = self
+            .methods
+            .iter()
+            .map(|m| {
+                let name = &m.name;
+                let docs = &m.docs;
+                let args = m.gen_args();
+                let ret = &m.ret;
+                quote! {
+                    #(#docs)*
+                    unsafe fn #name(&self, #(#args),*) #ret;
+                }
+            })
+            .collect::<Vec<_>>();
+        let parent = self.parent_trait_constraint();
+
+        quote! {
+            #[allow(non_camel_case_types)]
+            #vis trait #name: Sized + #parent {
+                #(#methods)*
+            }
+        }
+    }
+
+    /// Generates the vtable for a COM interface
+    fn gen_vtable(&self, vtable_name: &syn::Ident) -> proc_macro2::TokenStream {
+        let vis = &self.visibility;
+        let name = &self.name;
+        let trait_name = quote::format_ident!("{}_Impl", name);
+        let implvtbl_name = quote::format_ident!("{}_ImplVtbl", name);
+
+        let vtable_entries = self
+            .methods
+            .iter()
+            .map(|m| {
+                let name = &m.name;
+                let ret = &m.ret;
+                let args = m.gen_args();
+
+                if m.is_result() {
+                    quote! {
+                        pub #name: unsafe extern "system" fn(this: *mut ::core::ffi::c_void, #(#args),*) -> ::windows_core::HRESULT,
+                    }
+                } else {
+                    quote! {
+                        pub #name: unsafe extern "system" fn(this: *mut ::core::ffi::c_void, #(#args),*) #ret,
+                    }
+                }
+            })
+            .collect::<Vec<_>>();
+
+        let parent_vtable_generics = quote!(Identity, OFFSET);
+        let parent_vtable = self.parent_vtable();
+
+        // or_parent_matches will be `|| parent::matches(iid)` if this interface inherits from another
+        // interface (except for IUnknown) or will be empty if this is not applicable. This is what allows
+        // QueryInterface to work correctly for all interfaces in an inheritance chain, e.g.
+        // IFoo3 derives from IFoo2 derives from IFoo.
+        //
+        // We avoid matching IUnknown because object identity depends on the uniqueness of the IUnknown pointer.
+        let or_parent_matches = match parent_vtable.as_ref() {
+            Some(parent) if !self.parent_is_iunknown() => quote! (|| <#parent>::matches(iid)),
+            _ => quote!(),
+        };
+
+        let functions = self
+            .methods
+            .iter()
+            .map(|m| {
+                let name = &m.name;
+                let args = m.gen_args();
+                let params = &m
+                    .args
+                    .iter()
+                    .map(|a| {
+                        let pat = &a.pat;
+                        quote! { #pat }
+                    })
+                    .collect::<Vec<_>>();
+                let ret = &m.ret;
+
+                let ret = if m.is_result() {
+                    quote! { -> ::windows_core::HRESULT }
+                } else {
+                    quote! { #ret }
+                };
+
+                if parent_vtable.is_some() {
+                    quote! {
+                        unsafe extern "system" fn #name<
+                            Identity: ::windows_core::IUnknownImpl,
+                            const OFFSET: isize
+                        >(
+                            this: *mut ::core::ffi::c_void, // <-- This is the COM "this" pointer, which is not the same as &T or &T_Impl.
+                            #(#args),*
+                        ) #ret
+                        where
+                            Identity : #trait_name
+                        {
+                            // This step is essentially a virtual dispatch adjustor thunk. Its purpose is to adjust
+                            // the "this" pointer from the address used by the COM interface to the root of the
+                            // MyApp_Impl object.  Since a given MyApp_Impl may implement more than one COM interface
+                            // (and more than one COM interface chain), we need to know how to get from COM's "this"
+                            // back to &MyApp_Impl. The OFFSET constant gives us the value (in pointer-sized units).
+                            let this_outer: &Identity = &*((this as *const *const ()).offset(OFFSET) as *const Identity);
+
+                            // Last, we invoke the implementation function.
+                            // We use explicit <Impl as IFoo_Impl> so that we can select the correct method
+                            // for situations where IFoo3 derives from IFoo2 and both declare a method with
+                            // the same name.
+                            <Identity as #trait_name>::#name(this_outer, #(#params),*).into()
+                        }
+                    }
+                } else {
+                    quote! {
+                        unsafe extern "system" fn #name<Impl: #trait_name>(this: *mut ::core::ffi::c_void, #(#args),*) #ret {
+                            let this = (this as *mut *mut ::core::ffi::c_void) as *const ::windows_core::ScopedHeap;
+                            let this = (*this).this as *const Impl;
+                            (*this).#name(#(#params),*).into()
+                        }
+                    }
+                }
+            })
+            .collect::<Vec<_>>();
+
+        if let Some(parent_vtable) = parent_vtable {
+            let entries = self
+                .methods
+                .iter()
+                .map(|m| {
+                    let name = &m.name;
+                    quote!(#name: #name::<Identity, OFFSET>)
+                })
+                .collect::<Vec<_>>();
+
+            quote! {
+                #[repr(C)]
+                #[doc(hidden)]
+                #vis struct #vtable_name {
+                    pub base__: #parent_vtable,
+                    #(#vtable_entries)*
+                }
+                impl #vtable_name {
+                    pub const fn new<
+                        Identity: ::windows_core::IUnknownImpl,
+                        const OFFSET: isize,
+                    >() -> Self
+                    where
+                        Identity : #trait_name
+                    {
+                        #(#functions)*
+                        Self { base__: #parent_vtable::new::<#parent_vtable_generics>(), #(#entries),* }
+                    }
+
+                    #[inline(always)]
+                    pub fn matches(iid: &::windows_core::GUID) -> bool {
+                        *iid == <#name as ::windows_core::Interface>::IID
+                        #or_parent_matches
+                    }
+                }
+            }
+        } else {
+            let entries = self
+                .methods
+                .iter()
+                .map(|m| {
+                    let name = &m.name;
+                    quote!(#name: #name::<Impl>)
+                })
+                .collect::<Vec<_>>();
+
+            quote! {
+                #[repr(C)]
+                #[doc(hidden)]
+                #vis struct #vtable_name {
+                    #(#vtable_entries)*
+                }
+                impl #vtable_name {
+                    pub const fn new<Impl: #trait_name>() -> Self {
+                        #(#functions)*
+                        Self { #(#entries),* }
+                    }
+                }
+                struct #implvtbl_name<T: #trait_name> (::core::marker::PhantomData<T>);
+                impl<T: #trait_name> #implvtbl_name<T> {
+                    const VTABLE: #vtable_name = #vtable_name::new::<T>();
+                }
+                impl #name {
+                    fn new<'a, T: #trait_name>(this: &'a T) -> ::windows_core::ScopedInterface<'a, #name> {
+                        let this = ::windows_core::ScopedHeap { vtable: &#implvtbl_name::<T>::VTABLE as *const _ as *const _, this: this as *const _ as *const _ };
+                        let this = ::core::mem::ManuallyDrop::new(::windows_core::imp::Box::new(this));
+                        unsafe { ::windows_core::ScopedInterface::new(::core::mem::transmute(&this.vtable)) }
+                    }
+                }
+            }
+        }
+    }
+
+    /// Generates various conversions such as from and to `IUnknown`
+    fn gen_conversions(&self) -> proc_macro2::TokenStream {
+        let name = &self.name;
+        let name_string = format!("{name}");
+        quote! {
+            impl ::core::convert::From<#name> for ::windows_core::IUnknown {
+                fn from(value: #name) -> Self {
+                    unsafe { ::core::mem::transmute(value) }
+                }
+            }
+            impl ::core::convert::From<&#name> for ::windows_core::IUnknown {
+                fn from(value: &#name) -> Self {
+                    ::core::convert::From::from(::core::clone::Clone::clone(value))
+                }
+            }
+            impl ::core::clone::Clone for #name {
+                fn clone(&self) -> Self {
+                    Self(self.0.clone())
+                }
+            }
+            impl ::core::cmp::PartialEq for #name {
+                fn eq(&self, other: &Self) -> bool {
+                    self.0 == other.0
+                }
+            }
+            impl ::core::cmp::Eq for #name {}
+            impl ::core::fmt::Debug for #name {
+                fn fmt(&self, f: &mut ::core::fmt::Formatter<'_>) -> ::core::fmt::Result {
+                    f.debug_tuple(#name_string).field(&::windows_core::Interface::as_raw(self)).finish()
+                }
+            }
+        }
+    }
+
+    fn parent_type(&self) -> proc_macro2::TokenStream {
+        if let Some(parent) = &self.parent {
+            quote!(#parent)
+        } else {
+            quote!(::core::ptr::NonNull<::core::ffi::c_void>)
+        }
+    }
+
+    fn parent_vtable(&self) -> Option<proc_macro2::TokenStream> {
+        if let Some((ident, path)) = self.parent_path().split_last() {
+            let ident = quote::format_ident!("{}_Vtbl", ident);
+            Some(quote! { #(#path::)* #ident })
+        } else {
+            None
+        }
+    }
+
+    fn parent_is_iunknown(&self) -> bool {
+        if let Some(ident) = self.parent_path().last() {
+            ident == "IUnknown"
+        } else {
+            false
+        }
+    }
+
+    fn parent_path(&self) -> Vec<syn::Ident> {
+        if let Some(parent) = &self.parent {
+            parent
+                .segments
+                .iter()
+                .map(|segment| segment.ident.clone())
+                .collect()
+        } else {
+            vec![]
+        }
+    }
+
+    /// Gets the parent trait constraint which is nothing if the parent is IUnknown
+    fn parent_trait_constraint(&self) -> proc_macro2::TokenStream {
+        if let Some((ident, path)) = self.parent_path().split_last() {
+            if ident != "IUnknown" {
+                let ident = quote::format_ident!("{}_Impl", ident);
+                return quote! { #(#path::)* #ident };
+            }
+        }
+
+        quote! {}
+    }
+}
+
+impl syn::parse::Parse for Interface {
+    fn parse(input: syn::parse::ParseStream<'_>) -> syn::Result<Self> {
+        let attributes = input.call(syn::Attribute::parse_outer)?;
+        let mut docs = Vec::new();
+        for attr in attributes.into_iter() {
+            let path = attr.path();
+            if path.is_ident("doc") {
+                docs.push(attr);
+            } else {
+                return Err(syn::Error::new(path.span(), "Unrecognized attribute "));
+            }
+        }
+
+        let visibility = input.parse::<syn::Visibility>()?;
+        _ = input.parse::<syn::Token![unsafe]>()?;
+        _ = input.parse::<syn::Token![trait]>()?;
+        let name = input.parse::<syn::Ident>()?;
+        _ = input.parse::<syn::Token![:]>();
+        let parent = input.parse::<syn::Path>().ok();
+        let content;
+        syn::braced!(content in input);
+        let mut methods = Vec::new();
+        while !content.is_empty() {
+            methods.push(content.parse::<InterfaceMethod>()?);
+        }
+        Ok(Self {
+            visibility,
+            methods,
+            name,
+            parent,
+            docs,
+        })
+    }
+}
+
+/// Parsed interface guid attribute
+///
+/// ```rust,ignore
+/// #[windows_interface::interface("8CEEB155-2849-4ce5-9448-91FF70E1E4D9")]
+///                              //^ parses this
+/// unsafe trait IUIAnimationVariable: IUnknown {
+///     fn GetValue(&self, value: *mut f64) -> HRESULT;
+/// }
+/// ```
+struct Guid(Option<syn::LitStr>);
+
+impl Guid {
+    fn to_tokens(&self) -> syn::Result<proc_macro2::TokenStream> {
+        fn hex_lit(num: &str) -> syn::LitInt {
+            syn::LitInt::new(&format!("0x{num}"), proc_macro2::Span::call_site())
+        }
+
+        fn ensure_length(
+            part: Option<&str>,
+            index: usize,
+            length: usize,
+            span: proc_macro2::Span,
+        ) -> syn::Result<String> {
+            let part = match part {
+                Some(p) => p,
+                None => {
+                    return Err(syn::Error::new(
+                        span,
+                        format!("The IID missing part at index {index}"),
+                    ))
+                }
+            };
+
+            if part.len() != length {
+                return Err(syn::Error::new(
+                    span,
+                    format!(
+                        "The IID part at index {} must be {} characters long but was {} characters",
+                        index,
+                        length,
+                        part.len()
+                    ),
+                ));
+            }
+
+            Ok(part.to_owned())
+        }
+
+        if let Some(value) = &self.0 {
+            let guid_value = value.value();
+            let mut delimited = guid_value.split('-').fuse();
+            let chunks = [
+                ensure_length(delimited.next(), 0, 8, value.span())?,
+                ensure_length(delimited.next(), 1, 4, value.span())?,
+                ensure_length(delimited.next(), 2, 4, value.span())?,
+                ensure_length(delimited.next(), 3, 4, value.span())?,
+                ensure_length(delimited.next(), 4, 12, value.span())?,
+            ];
+
+            let data1 = hex_lit(&chunks[0]);
+            let data2 = hex_lit(&chunks[1]);
+            let data3 = hex_lit(&chunks[2]);
+            let (data4_1, data4_2) = chunks[3].split_at(2);
+            let data4_1 = hex_lit(data4_1);
+            let data4_2 = hex_lit(data4_2);
+            let (data4_3, rest) = chunks[4].split_at(2);
+            let data4_3 = hex_lit(data4_3);
+
+            let (data4_4, rest) = rest.split_at(2);
+            let data4_4 = hex_lit(data4_4);
+
+            let (data4_5, rest) = rest.split_at(2);
+            let data4_5 = hex_lit(data4_5);
+
+            let (data4_6, rest) = rest.split_at(2);
+            let data4_6 = hex_lit(data4_6);
+
+            let (data4_7, data4_8) = rest.split_at(2);
+            let data4_7 = hex_lit(data4_7);
+            let data4_8 = hex_lit(data4_8);
+            Ok(quote! {
+                ::windows_core::GUID {
+                    data1: #data1,
+                    data2: #data2,
+                    data3: #data3,
+                    data4: [#data4_1, #data4_2, #data4_3, #data4_4, #data4_5, #data4_6, #data4_7, #data4_8]
+                }
+            })
+        } else {
+            Ok(quote! {
+                ::windows_core::GUID::zeroed()
+            })
+        }
+    }
+}
+
+impl syn::parse::Parse for Guid {
+    fn parse(cursor: syn::parse::ParseStream<'_>) -> syn::Result<Self> {
+        let string: Option<syn::LitStr> = cursor.parse().ok();
+
+        Ok(Self(string))
+    }
+}
+
+/// A parsed interface method
+///
+/// ```rust,ignore
+/// #[windows_interface::interface("8CEEB155-2849-4ce5-9448-91FF70E1E4D9")]
+/// unsafe trait IUIAnimationVariable: IUnknown {
+///     fn GetValue(&self, value: *mut f64) -> HRESULT;
+///   //^ parses this
+/// }
+/// ```
+struct InterfaceMethod {
+    pub name: syn::Ident,
+    pub visibility: syn::Visibility,
+    pub args: Vec<InterfaceMethodArg>,
+    pub ret: syn::ReturnType,
+    pub docs: Vec<syn::Attribute>,
+}
+
+impl InterfaceMethod {
+    fn is_result(&self) -> bool {
+        if let syn::ReturnType::Type(_, ty) = &self.ret {
+            if let syn::Type::Path(path) = &**ty {
+                if let Some(segment) = path.path.segments.last() {
+                    let ident = segment.ident.to_string();
+                    if ident == "Result" {
+                        if let syn::PathArguments::AngleBracketed(args) = &segment.arguments {
+                            if args.args.len() == 1 {
+                                return true;
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
+        false
+    }
+
+    /// Generates arguments (of the form `$pat: $type`)
+    fn gen_args(&self) -> Vec<proc_macro2::TokenStream> {
+        self.args
+            .iter()
+            .map(|a| {
+                let pat = &a.pat;
+                let ty = &a.ty;
+                quote! { #pat: #ty }
+            })
+            .collect::<Vec<_>>()
+    }
+
+    fn gen_consume_generics(&self) -> Vec<proc_macro2::TokenStream> {
+        self.args
+            .iter()
+            .enumerate()
+            .filter_map(|(generic_index, a)| {
+                if let Some((ty, ident)) = a.borrow_type() {
+                    let generic_ident = quote::format_ident!("P{generic_index}");
+                    if ident == "Ref" {
+                        Some(quote! { #generic_ident: ::windows_core::Param<#ty> })
+                    } else {
+                        Some(quote! { #generic_ident: ::windows_core::OutParam<#ty> })
+                    }
+                } else {
+                    None
+                }
+            })
+            .collect::<Vec<_>>()
+    }
+
+    fn gen_consume_params(&self) -> Vec<proc_macro2::TokenStream> {
+        self.args
+            .iter()
+            .enumerate()
+            .map(|(generic_index, a)| {
+                let pat = &a.pat;
+
+                if a.borrow_type().is_some() {
+                    let generic_ident = quote::format_ident!("P{generic_index}");
+                    quote! { #pat: #generic_ident }
+                } else {
+                    let ty = &a.ty;
+                    quote! { #pat: #ty }
+                }
+            })
+            .collect::<Vec<_>>()
+    }
+
+    fn gen_consume_args(&self) -> Vec<proc_macro2::TokenStream> {
+        self.args
+            .iter()
+            .map(|a| {
+                let pat = &a.pat;
+
+                if let Some((_, ident)) = a.borrow_type() {
+                    if ident == "Ref" {
+                        quote! { #pat.param().borrow() }
+                    } else {
+                        quote! { #pat.borrow_mut() }
+                    }
+                } else {
+                    quote! { #pat }
+                }
+            })
+            .collect::<Vec<_>>()
+    }
+}
+
+impl syn::parse::Parse for InterfaceMethod {
+    fn parse(input: syn::parse::ParseStream<'_>) -> syn::Result<Self> {
+        let docs = input.call(syn::Attribute::parse_outer)?;
+        let visibility = input.parse::<syn::Visibility>()?;
+        let method = input.parse::<syn::TraitItemFn>()?;
+        unexpected_token!(docs.iter().find(|a| !a.path().is_ident("doc")), "attribute");
+        unexpected_token!(method.default, "default method implementation");
+        let sig = method.sig;
+        unexpected_token!(sig.abi, "abi declaration");
+        unexpected_token!(sig.asyncness, "async declaration");
+        unexpected_token!(sig.generics.params.iter().next(), "generics declaration");
+        unexpected_token!(sig.constness, "const declaration");
+        expected_token!(
+            sig.receiver(),
+            "the method to have &self as its first argument"
+        );
+        unexpected_token!(sig.variadic, "variadic args");
+        let args = sig
+            .inputs
+            .into_iter()
+            .filter_map(|a| match a {
+                syn::FnArg::Receiver(_) => None,
+                syn::FnArg::Typed(p) => Some(p),
+            })
+            .map(|p| {
+                Ok(InterfaceMethodArg {
+                    ty: p.ty,
+                    pat: p.pat,
+                })
+            })
+            .collect::<Result<Vec<InterfaceMethodArg>, syn::Error>>()?;
+
+        let ret = sig.output;
+        Ok(InterfaceMethod {
+            name: sig.ident,
+            visibility,
+            args,
+            ret,
+            docs,
+        })
+    }
+}
+
+/// An argument to an interface method
+struct InterfaceMethodArg {
+    /// The type of the argument
+    pub ty: Box<syn::Type>,
+    /// The name of the argument
+    pub pat: Box<syn::Pat>,
+}
+
+impl InterfaceMethodArg {
+    fn borrow_type(&self) -> Option<(syn::Type, String)> {
+        if let syn::Type::Path(path) = &*self.ty {
+            if let Some(segment) = path.path.segments.last() {
+                let ident = segment.ident.to_string();
+                if matches!(ident.as_str(), "Ref" | "OutRef") {
+                    if let syn::PathArguments::AngleBracketed(args) = &segment.arguments {
+                        if args.args.len() == 1 {
+                            if let Some(syn::GenericArgument::Type(ty)) = args.args.first() {
+                                return Some((ty.clone(), ident));
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
+        None
+    }
+}